Here's a set of books that I did in XHTML, with CSS. Take a look at it in a browser and then in a Jetbook and maybe that will let you know. In the browser, the books will look best at around 600 pixels wide.
In FBReader they look really ugly; all the cool formatting is dropped (including suppressing unnecessary headers.) Try zipping one of the books into a file with extension
zip. If Jetbook is using FBReader, it will show up and the files inside will be accessible (assuming a late enough version of FBReader.)
Thanks,
m a r
ps: what is the best way to encourage Ectaco to update and include features?